Complete Uninstall of Ubunto 11.04 and Installing Windows 7 from CD

Hi, I have recently installed Ubuntu 11.04 and completely wiped out Windows 7 on my Sony Vaio laptop. Now when I boot the laptop, Ubuntu load up fine. But I want to install windows 7 back to the ssystem. When I insert Windows disc, the laptop do not boot from the Disc. I tried to disabling booting from hard disc and left only option to load from the optical drive, but the system still do not read the disc and gives me error: No OS found. I am not sure how I can uninstall Ubuntu completely and install Windows 7 from the Disc. And I do not have a partion on HD from where I can run Windows 7. Linux is using the whole HD. Can someone please help?

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